Answer
The formation of Earth began about 4.6 billion years ago through accretion and collisions of dust, gas, and planetesimals within the solar nebula. Over time, the growing mass of Earth experienced heating from radioactive decay and gravitational compression, leading to the separation of materials into layers. The core formed from the densest metallic materials, surrounded by the mantle composed of semi-solid rock, and the outermost crust, which initially consisted of molten rock due to intense heat. The process of cooling and solidification of the crust resulted in the formation of the earliest rocks. As Earth continued to cool, water vapor and gases released from volcanic activity eventually formed the primordial atmosphere.
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